A massive abyssal whale-like sea monster drifting through the dark depths of the ocean — its skin is rough and ancient, covered in deep scars, barnacles, and bioluminescent patterns. Its eyes are glowing pale blue, emotionless and ancient. Huge fins shaped like torn sails stretch from its sides, and its mouth opens like a cavern, lined with rows of jagged, spiraling teeth. Long tendrils hang from its underside, glowing faintly. Its call echoes like a deep, haunting moan across the ocean trench. Surrounding it are tiny glowing creatures and particles, emphasizing its scale. Ultra-detailed 3D rendering, photorealistic lighting, cinematic underwater mood, volumetric fog, dark fantasy creature design."